Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba006b7c0f24a95…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 22:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a973478201a599434df408eb197fe64 SHA-1: 98590dededa6b09d7d6e11782759159c21107275 SHA-256: aba006b7c0f24a9506f3da57eebf4deb4a6f221bd1fcecfbde7bedd36cf5599a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic findings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=easy+recovery+essentials+bootable+iso+windows+10+free+download PDF link annotation
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/fixuduzewelotemulomuzeki.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/32262640453.pdfIn PDF document text
    • http://sbcnepal.com/images/file/27118885599.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/771b96d176026d0ba779c4d78ce5b3ce/luwefozivu.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///xazutesopujonibadojoli.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/tekop.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/bakemabu.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/ravated.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/joropawefex.pdfIn PDF document text
    • http://vaynhe.com/upload/files/fefevomegitepod.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/25258690704.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/62048087344.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cd5b84f8---ropixivadixufag.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/goraxilegapawalizowixa.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/96714256801.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/48400713262.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/lawipoximuletisarib.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/tebonipaxilivu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d88ed24ac---zorozuzebuluzolavi.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/14/file/xifidudefolibomi.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/21783084284.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/80067939349.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/72139965494.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 18408 bytes
SHA-256: 8b8ccf1fcbd0681907c9322381bef0904383b19626d1e459c7a2455ab5f3f737
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 11032 bytes
SHA-256: fa4782742a3890bf3e15e483266614de56e966243e12844bbeea22bbd2387383

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